<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
    <title>调用浏览器下载功能（兼容各主流浏览器）</title>
</head>
<style>
    img#downImg{
        display: none;
    }
</style>
<body>
<div id="down">
    <a id="downLoad">Click Me!</a>
</div>
</body>
</html>
<script>
//判断浏览器类型
    function myBrowser(){
        var userAgent = navigator.userAgent; //取得浏览器的userAgent字符串
        var isOpera = userAgent.indexOf("Opera") > -1;
        if (isOpera) {
            return "Opera"
        }; //判断是否Opera浏览器
        if (userAgent.indexOf("Firefox") > -1) {
            return "FF";
        } //判断是否Firefox浏览器
        if (userAgent.indexOf("Chrome") > -1){
            return "Chrome";
        }
        if (userAgent.indexOf("Safari") > -1) {
            return "Safari";
        } //判断是否Safari浏览器
        if (userAgent.indexOf("compatible") > -1 && userAgent.indexOf("MSIE") > -1 && !isOpera) {
            return "IE";
        }; //判断是否IE浏览器
        if (userAgent.indexOf("Trident") > -1) {
            return "Edge";
        } //判断是否Edge浏览器
    }

function SaveAs5(imgURL)
{
    var oPop = window.open(imgURL,"","width=1, height=1, top=5000, left=5000");
    for(; oPop.document.readyState != "complete"; )
    {
        if (oPop.document.readyState == "complete")break;
    }
    oPop.document.execCommand("SaveAs");
    oPop.close();
}

    function oDownLoad(url) {
        myBrowser();
        if (myBrowser()==="IE"||myBrowser()==="Edge"){
            //IE
            odownLoad.href="#";
            var oImg=document.createElement("img");
            oImg.src=url;
            oImg.id="downImg";
            var odown=document.getElementById("down");
            odown.appendChild(oImg);
            SaveAs5(document.getElementById('downImg').src)
        }else{
            //!IE
            odownLoad.href=url;
            odownLoad.download="";
        }
    }

var odownLoad=document.getElementById("downLoad");
odownLoad.onclick=function () {
    oDownLoad("http://7xnady.com1.z0.glb.clouddn.com/Files/201706190902418783b.jpg")
}

</script>
